Substituted fluoroaromatics, process for preparing them and their use

Benzaldehydes and benzoic acids having trifluoromethyl or trifluoromethoxy substituents, with or without additional fluorine substituents, are described extensively in the chemical literature as starting materials for the synthesis of active ingredients (for example U.S. Pat. No. 3,830,805 for aldehydes, EP-A-612 723 for benzoic acids), electronics materials, (JP-A-06 025 120) or generally as intermediates (EP-B-0 396 987). Compounds of the formula (I) and also process for preparing them where substituents X, X, Y and Z are defined as follows:Xis H or FXis H or FY is CI, Br, or IZ is CHO or COOH or CNn is 0 or 1and also their use as starting material for preparing agrochemicals, electronics materials and pharmaceuticals.